Microwave oven

Abstract

The utility model provides a microwave oven which comprises a cavity, a connector is arranged at the bottom of the cavity and used for driving a glass rotating disc to rotate, the microwave oven further comprises a plurality of roller assemblies, the roller assemblies are distributed on the edge of the glass rotating disc, and each roller assembly comprises a roller. The lower portion of the roller is suspended, and the upper portion of the roller abuts against the lower surface of the glass rotating disc and rotates along with rotation of the glass rotating disc. The roller of the microwave oven is not in contact with the bottom of the cavity in the working process, so that the situation that a powder spraying layer of the bottom plate of the cavity falls off or even is rusted is not easy to occur; a user does not need to independently install the roller assembly in the cooking process, and other abnormal problems caused by non-standard installation of the roller assembly do not exist; the rolling wheel assembly and the glass rotating disc are in rolling support, the contact area is small, and running resistance and noise are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of household appliances, in particular to a microwave oven. Background Art

[0002] Microwave ovens use high-frequency microwaves emitted by magnetrons to act on water molecules in food, using the heat generated by the high-speed movement and friction of water molecules to quickly heat food. They have become one of the indispensable cooking appliances in modern families.

[0003] To ensure that food is heated evenly, a rotatable glass turntable is generally installed at the bottom of the microwave oven cavity. The rotating glass turntable drives the food to rotate, thereby evenly heating the food and achieving a good cooking effect. To ensure that the glass turntable does not tilt in the cavity, a roller bracket is usually installed at its bottom for support. The roller bracket is equipped with a circular roller that slides relative to the cavity when the glass turntable rotates. For example, application number 201922182925.3 is the applicant's prior application, which discloses a roller bracket including a bracket body, a plurality of fixed shafts provided on the bracket body, a connecting strip formed between two adjacent fixed shafts, and a buffer portion provided on at least one of the connecting strips. The buffer portion includes an outer buffer surface and / or an inner buffer.

[0004] This solution effectively prevents the roller bracket from breaking or being damaged, but the roller's rolling motion within the cavity will continuously wear away the metal surface, causing rust to form on the cavity bottom. Furthermore, the roller bracket is prone to misalignment and tilting within the cavity, which can severely cause the glass turntable to become stuck and unable to rotate, affecting the uniformity of food heating and severely impacting the customer experience. In light of these factors, the present invention is proposed. Utility Model Content

[0005] The problem solved by the utility model is that the structure of the roller assembly of the existing microwave oven is unreasonable, the installation position is easily offset, and the roller is in contact with the bottom plate for a long time, which may cause the powder coating on the surface to fall off or even rust.

[0006] To solve the above problems, the present invention provides a microwave oven, comprising a cavity, a connector being provided at the bottom of the cavity for driving a glass turntable to rotate, the microwave oven also comprising a roller assembly, a plurality of roller assemblies being provided and distributed along the edge of the glass turntable, the roller assembly comprising a roller, the lower portion of the roller being suspended in the air and the upper portion of the roller being in contact with the lower surface of the glass turntable and rotating as the glass turntable rotates.

[0007] This setting fixes the roller assembly on the cavity bottom plate. During operation, the roller of the roller bracket does not contact the cavity bottom plate, and there is no problem of the powder coating layer of the cavity bottom plate falling off or even rusting; there is a rolling support between the roller assembly and the glass turntable, and the contact area is small, which reduces the running resistance and noise; at the same time, the user does not need to install the roller assembly separately during the cooking process, and there are no other abnormal problems caused by improper installation of the roller assembly.

[0008] Preferably, there are multiple roller assemblies arranged at equal intervals along the outer periphery of the connector. This arrangement ensures that the outer periphery of the glass turntable is evenly stressed, effectively preventing the glass turntable from shifting during rotation, and ensuring stable and reliable operation.

[0009] Preferably, the roller assembly includes a bracket and a roller, wherein the bracket includes a vertically arranged mounting plate for providing a mounting position for the roller; the roller is rotatably mounted on one side of the mounting plate, and the roller portion is arranged higher than the mounting plate. This arrangement has a simple structure and high assembly efficiency.

[0010] Preferably, the bracket further includes a horizontally disposed bottom plate connected to the mounting plate. The cavity includes a cavity bottom plate, which is provided with a recessed portion and a truncated cone. The recessed portion is annular and located on the outer periphery of the truncated cone. The bottom plate is fixedly assembled to the recessed portion, and the truncated cone is used to mount the connector. This arrangement provides space for mounting the roller assembly, making the cavity structure compact and providing a good user experience.

[0011] Preferably, two sides of the base plate extend horizontally to form first and second support portions for secure assembly with the cavity base plate. The first and second support portions are located on the side of the mounting plate away from the base plate. This arrangement allows the mounting plate to assemble with the cavity base plate at three locations around the mounting plate, ensuring uniform and stable force distribution and a long service life.

[0012] Preferably, the roller assembly further comprises a bolt and a nut, the mounting plate being provided with a through-hole, the bolt comprising a connected nut and a screw, the screw sequentially passing through the roller and the through-hole and then being threadedly connected to the nut. This arrangement is structurally simple, provides stable and reliable assembly, and eliminates the need for adjustment of the roller assembly position, making operation convenient for the user.

[0013] Preferably, the roller includes an inner ring and an outer ring, the inner ring is used to support and shape the outer ring, the outer ring is sleeved on the outside of the inner ring for elastic wrapping, and the material hardness of the inner ring is greater than that of the outer ring.

[0014] This setting makes it possible to use two different materials for the roller. For example, the inner ring of the roller is made of metal or a special plastic material that does not absorb microwaves, so that the inner ring of the roller can be used for a long time in a microwave environment without being interfered with or damaged by microwaves; at the same time, the outer ring of the roller is made of silicone or resin material, which not only has the characteristics of soft texture and elastic deformation, but also can remain stable in a microwave environment and will not cause damage to the glass turntable.

[0015] Preferably, the inner ring of the roller includes a first support shaft and a first limiting plate, a first connecting hole is provided at a position of the first support shaft close to the center axis, and the first limiting plate is provided on the outside of the first support shaft; the outer ring of the roller includes a wrapping ring, a first mounting hole is provided on the inner side of the wrapping ring close to the center axis, the first support shaft is inserted into the first mounting hole and is limited by the first limiting plate.

[0016] This setting further optimizes the connection structure between the inner ring of the roller and the outer ring of the roller, making the connection between the inner ring of the roller and the outer ring of the roller more stable, effectively preventing the roller from shaking and deflecting during rotation, and extending the service life of the roller.

[0017] Preferably, the inner ring of the roller also includes a second limit plate, and the first limit plate and the second limit plate are respectively arranged at the opposite ends of the first support shaft along the center axis direction, and a first limit groove is formed on the first limit plate, the second limit plate and the outside of the first support shaft, and the first mounting hole of the outer ring of the roller is sleeved on the first support shaft.

[0018] This setting further optimizes the structural design of the roller, making the connection between the inner ring and the outer ring of the roller more stable. At the same time, the first mounting hole is sleeved on the first support shaft, further ensuring the flexible rotation and stability of the roller, while improving the convenience of roller installation and maintenance.

[0019] Preferably, a second limiting groove is provided at each of the two opposite ends of the wrapping ring perpendicular to the central axis, and the two second limiting grooves are used to accommodate the first limiting plate and the second limiting plate. This arrangement makes the cross-section of the outer ring of the roller approximately "T"-shaped, and the first limiting plate and the second limiting plate on opposite sides of the first support shaft on the inner ring of the roller are engaged and retained in the two second limiting grooves.

[0020] Compared with the prior art, the microwave oven described in the present invention has the following beneficial effects: 1) By suspending the bottom of the roller, it can avoid contact with the cavity bottom plate, effectively preventing the powder spray layer of the cavity bottom plate from falling off or even rusting; 2) There is a rolling support between the roller assembly and the glass turntable, and the contact area is small, which reduces the running resistance and noise; 3) The user does not need to install the roller assembly separately during the cooking process, and there are no other abnormal problems such as misalignment caused by improper installation of the roller assembly; 4) The structure is simple and easy to produce and process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of a microwave oven in the prior art;

[0022] Figure 2 It is a structural schematic diagram of a roller bracket in the prior art;

[0023] Figure 3 This is a schematic diagram of the assembly of the roller assembly in the cavity according to Example 1 of the present utility model;

[0024] Figure 4 This is an exploded schematic diagram of the roller assembly described in Example 1 of the present utility model;

[0025] Figure 5 This is a schematic structural diagram of the roller described in Example 2 of the present utility model;

[0026] Figure 6 This is an exploded schematic diagram of the roller described in Example 2 of the present utility model.

[0027] Description of reference numerals:

[0028] 1-Door assembly; 2-Control panel; 3-Cavity; 31-Cavity bottom plate; 311-Recessed portion; 312-Front table; 4-Connector; 5-Roller assembly; 51-Bracket; 511-Bottom plate; 512-Mounting plate; 5121-Perforation; 513-First support portion; 514-Second support portion; 52-Roller; 521-Roller inner ring; 5211-First support shaft; 5212-First limit plate; 5213 -first connecting hole; 5214-first arc-shaped transition part; 5215-second limiting plate; 5216-first limiting groove; 522-roller outer ring; 5221-wrapping ring; 5222-first mounting hole; 5223-second limiting groove; 53-bolt; 531-nut; 532-screw; 533-assembly part; 54-nut; 6-glass turntable; 7-roller bracket; 71-support frame; 72-rolling wheel. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more clearly understood, the following is a detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings. The technical features of the embodiments of the present invention can be combined with each other without conflict.

[0030] In the description of this utility model, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections; they can refer to direct connections, indirect connections through an intermediary, or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0031] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the illustrative use of the above terms does not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0032] As a common household appliance, microwave ovens are popular among people for their advantages of convenient and quick heating of food and simple operation. A conventional microwave oven is provided with a glass turntable 6 for placing food and a roller bracket 7 for supporting the glass turntable 6 in the heating chamber. The glass turntable 6 is driven to rotate by a motor 8 provided at the bottom of the heating chamber. The roller bracket 7 includes a support frame 71 and a rotatable roller 72 provided on the edge of the support frame 71. Figure 1-2 shown.

[0033] However, this solution has the following drawbacks: 1) If the roller bracket 7 is offset, it will cause uneven heating and even the risk of microwave focusing; 2) The roller 72 is in contact with the lower surface of the cavity 3 for a long time, which will cause the powder layer on the metal surface to fall off; 3) The roller bracket 7 is made of plastic and is very likely to break or damage if accidentally dropped during cleaning. To address this, the applicant proposes the following technical solution:

[0034] Example 1

[0035] like Figure 3-4As shown, a microwave oven includes a cavity 3, wherein the cavity 3 is specifically a cavity bottom plate 31, and a connector 4 is provided on the cavity bottom plate 31 for driving a glass turntable 6 to rotate; the microwave oven also includes a roller assembly 5 fixedly mounted on the cavity bottom plate 31, and the roller assemblies 5 are multiple and distributed on the outer peripheral side of the connector 4, and the roller assembly 5 includes a roller 52, which abuts against the lower side of the glass turntable 6 and rotates as the glass turntable 6 rotates.

[0036] This arrangement secures the roller assembly 5 to the cavity floor 31. During operation, the roller 52 does not contact the cavity floor 31, preventing the powder coating on the cavity floor 31 from falling off or even rusting. The roller assembly and glass turntable 6 are supported by rolling elements, minimizing the contact area and reducing operational resistance and noise. Furthermore, the user does not need to separately install the roller assembly 5 during cooking, eliminating any potential issues that may arise from improper installation of the roller assembly 5. The connector 4 is driven by a motor for rotation, and its structure and assembly are conventional and will not be further described here.

[0037] As an example of the present invention, there are three roller assemblies 5 arranged at equal intervals along the outer periphery of the connector 4. This arrangement ensures that the outer periphery of the glass turntable 6 is evenly stressed, effectively preventing the glass turntable 6 from shifting during rotation, and ensuring stable and reliable operation.

[0038] As an example of the present invention, the cavity bottom plate 31 is provided with a recessed portion 311 and a truncated platform 312. The recessed portion 311 is formed by partially recessing the cavity bottom plate 31 and is located on the outer periphery of the truncated platform 312, for mounting the roller assembly 5; the truncated platform 312 is for mounting the connector 4. This arrangement provides space for mounting the roller assembly 5, resulting in a compact structure within the cavity 3 and a good user experience. This structure also increases the mechanical strength of the cavity bottom plate 31 and provides a mounting location for the motor that drives the connector 4.

[0039] As an example of the present invention, the roller assembly 5 includes a bracket 51 and a roller 52. The bracket 51 includes a connected base plate 511 and a mounting plate 512. The base plate 511 is fixedly mounted on the cavity bottom plate 31. The mounting plate 512 is vertically arranged to provide a mounting position for the roller 52. The roller 52 is rotatably mounted on the mounting plate 512. The roller 52 is partially elevated above the highest point of the mounting plate 512 and abuts against the glass turntable 6. This arrangement is simple in structure, secure in installation, and easy to manufacture.

[0040] As an example of the present invention, the base plate 511 extends horizontally on both sides of the mounting plate 512 to form a first support portion 513 and a second support portion 514 for fixed assembly with the cavity bottom plate 31. The first support portion 513 and the second support portion 514 are located on the side of the mounting plate 512 away from the base plate 511. This arrangement allows three locations around the mounting plate 512 to be assembled with the cavity bottom plate 31, with uniform and stable force and a long service life. Preferably, the mounting plate 512 and the base plate 511 are integrally formed. This arrangement can further improve assembly efficiency and increase the mechanical strength of the bracket 51.

[0041] As an example of the present invention, the roller assembly 5 further includes a bolt 53 and a nut 54. The mounting plate 512 is provided with a through-hole 5121. The bolt 53 sequentially passes through the roller 52 and the through-hole 5121 before being threadedly assembled with the nut 54. This arrangement is structurally simple and highly efficient. Preferably, the bolt 53 includes a connected nut 531 and a screw rod 532. The free end of the screw rod 532 is provided with an externally threaded assembly portion 533 for threaded engagement with the nut 54.

[0042] The microwave oven also includes a door assembly 1 and a control panel 2. A first opening is formed on one side of the cavity 3, and the door assembly 1 is openably and closably arranged at the first opening. The control panel 2 is located on one side of the door assembly 1. Its specific structure and assembly relationship are all existing technologies and will not be elaborated here.

[0043] Example 2

[0044] like Figure 5 、 6 As shown, the roller 52 consists of a roller inner ring 521 and a roller outer ring 522. The roller inner ring 521 is integrally formed of metal material or plastic material that does not absorb microwaves, and the roller outer ring 522 is integrally formed of silicone or resin material that has elastic deformation and can be used in a microwave environment. The roller outer ring 522 is arranged in a wrapped shape on the outside of the roller inner ring 521. The roller outer ring 522 and the roller inner ring 521 are detachably connected or integrally formed by injection molding.

[0045] The roller 52 described in the present application is made of two different materials, namely, the inner ring 521 of the roller is made of metal material (such as stainless steel, aluminum alloy and other conventional materials in the prior art) or special plastic material that does not absorb microwaves (such as SPS, BMC materials and other conventional materials in the prior art). This choice allows the inner ring 521 of the roller to be used for a long time in a microwave environment without being interfered with or damaged by microwaves; at the same time, the outer ring 522 of the roller is made of silicone or resin material. Such materials not only have the characteristics of soft texture and elastic deformation, but also can remain stable in a microwave environment. Due to the softness and elasticity of the silicone or resin material, the outer ring 522 of the roller is wrapped around the outside of the inner ring 521 of the roller and contacts the glass turntable 6 without causing damage to it.

[0046] Preferably, the roller inner ring 521 is used to support and shape the roller outer ring 522. The roller outer ring 522 is elastically wrapped around the roller inner ring 521. The material hardness of the roller inner ring 521 is greater than that of the roller outer ring 522. Preferably, the roller inner ring 521 (metal material or special plastic material that does not absorb microwaves) has an HRC (Rockwell hardness) range of 40-60 or an HB (Brinell hardness) range of 100-200, and the roller outer ring 522 (silicone or resin material) has a Shore hardness of 30-70 (silicone) or 30-60 (soft resin). This setting optimizes the hardness difference between the materials of the roller inner ring 521 and the roller outer ring 522. The high-hardness inner ring enhances the wear resistance and deformation resistance of the roller, maintaining long-term stability; the soft outer ring provides good shock absorption effect, reduces noise and vibration, and protects the roller from damage in complex environments, so that the roller 52 can better adapt to different environments during operation and increase its service life.

[0047] Preferably, the roller inner ring 521 includes a first support shaft 5211 and a first limiting plate 5212, and the first limiting plate 5212 is arranged on the outside of the first support shaft 5211; the roller outer ring 522 includes a wrapping ring 5221, and a first mounting hole 5222 is arranged on the inner side of the wrapping ring 5221 close to the center axis, and the first support shaft 5211 is inserted into the first mounting hole 5222 and is limited by the first limiting plate 5212.

[0048] This setting further optimizes the connection structure between the roller inner ring 521 and the roller outer ring 522, making the connection between the roller inner ring 521 and the roller outer ring 522 more stable, effectively preventing the roller 52 from shaking and deflecting during rotation, and extending the service life of the roller 52.

[0049] Preferably, the roller inner ring 521 also includes a second limiting plate 5215, and the first limiting plate 5212 and the second limiting plate 5215 are respectively arranged at the opposite ends of the first support shaft 5211 along the center axis direction, and a first limiting groove 5216 is formed on the outside of the first limiting plate 5212, the second limiting plate 5215 and the first support shaft 5211, and the first mounting hole 5222 of the roller outer ring 522 is sleeved on the first support shaft 5211.

[0050] This setting further optimizes the structural design of the roller 52, making the connection between the roller inner ring 521 and the roller outer ring 522 more stable. At the same time, the first mounting hole 5222 is sleeved on the first support shaft 5211, further ensuring the flexible rotation and stability of the roller 52, while improving the convenience of installation and maintenance of the roller 52.

[0051] Preferably, a second limiting groove 5223 is provided at each of the opposite ends of the wrapping ring 5221 perpendicular to the central axis, and the two second limiting grooves 5223 are used to accommodate the first limiting plate 5212 and the second limiting plate 5215. As a specific example of the present application, the second limiting groove 5223 extends to the first mounting hole 5222 along the radial direction of the first mounting hole 5222. In the example of the present application, by providing a second limiting groove 5223 on each of the opposite sides of the wrapping ring 5221, the cross-section of the outer ring 522 of the roller is approximately T-shaped, and the first limiting plates 5212 and the second limiting plates 5215 on the opposite sides of the first support shaft 5211 on the inner ring 521 of the roller are engaged and limited in the two second limiting grooves 5223. Preferably, the first limiting plate 5212 is designed to be inclined gradually away from the second limiting plate 5215 from the connection end close to the first support shaft 5211 to the free end on the other side, and the second limiting plate 5215 is designed to be inclined gradually away from the first limiting plate 5212 from the connection end close to the first support shaft 5211 to the free end on the other side. Preferably, the first limiting plate 5212 and the second limiting plate 5215 have equal angles relative to the direction perpendicular to the central axis of the first support shaft 5211.

[0052] This design makes the connection between the inner ring 521 of the roller and the outer ring 522 of the roller tighter by adding a second limiting groove 5223 and adopting an inclined first limiting plate 5212 and a second limiting plate 5215, further reducing shaking and deviation. The inclined assembly structure optimizes the coordination between the limiting plate and the limiting groove of the roller 52, enhances the overall stability of the roller 52, ensures that the roller 52 rotates more smoothly, and extends its service life.

[0053] Preferably, a first connecting hole 5213 is provided near the central axis of the first support shaft 5211. Preferably, a first arcuate transition portion 5214 is formed at the connection between the first support shaft 5211 and the first limiting plate 5212. Similarly, a first arcuate transition portion 5214 is formed at the connection between the first support shaft 5211 and the second limiting plate 5215. The first connecting hole 5213 is connected to the two first arcuate transition portions 5214.

[0054] This arrangement facilitates the connection between the roller 52 and the bracket 51 through the first connection hole 5213, making installation and removal of the roller 52 more convenient and quick, and also improving the adaptability and maintainability of the roller 52. In addition, by optimizing the structural design of the connection, stress concentration is reduced, further extending the service life of the roller 52.

[0055] Preferably, the outer diameter of the roller inner ring 521 and the outer diameter of the roller outer ring 522 are spaced apart by a distance D, where D is ≥ 0.5 mm. In the example of the present application, the outer diameter of the roller inner ring 521 is the projected distance between the outer contour of the first limiting plate 5212 or the second limiting plate 5215 on the roller inner ring 521, away from the first support shaft 5211, and the central axis of the first connecting hole 5213. The outer diameter of the roller outer ring 522 is the projected distance between the outer surface contour of the wrapping ring 5221, which abuts the lower surface of the glass turntable 6, and the central axis of the first connecting hole 5213.

[0056] This design ensures that the roller 52 has a compact structure while also taking into account slight deformation and friction during actual installation and use, thereby avoiding sparks when the roller inner ring 521 is made of metal material, allowing it to maintain a stable operating state during long-term use.

[0057] The roller 52 disclosed in the present application ensures the stability and durability of the roller 52 in a microwave environment through ingenious structural design and material selection. The roller outer ring 522 made of soft and elastic silicone or resin material is combined with the roller inner ring 521 with greater hardness, which optimizes the support structure of the roller 52, protects the contact surface from damage, and provides a good shock-absorbing effect, so that the roller 52 rotates more smoothly and flexibly, has a compact structure, stable connection, and reliable use, meeting the environmental protection design requirements of the roller 52.

[0058] Although the present invention is disclosed as above, it is not limited thereto. Any person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope defined by the claims.

Claims

1. A microwave oven, comprising a cavity (3), wherein a connector (4) is provided at the bottom of the cavity (3) for driving a glass turntable (6) to rotate, characterized in that: The microwave oven further comprises a roller assembly (5), wherein the roller assembly (5) has a plurality of roller assemblies and is distributed on the edge of the glass turntable (6), the roller assembly (5) comprises a roller (52), the lower portion of the roller (52) is suspended in the air and the upper portion is in contact with the lower surface of the glass turntable (6) and rotates with the rotation of the glass turntable (6); the roller assembly (5) comprises a bracket (51) and a roller (52), the bracket (51) comprises a vertically arranged mounting plate (512) for providing a mounting position for the roller (52); the roller (52) is rotatably mounted on one side of the mounting plate (512), and the roller (52) is partially arranged higher than the mounting plate (512); the bracket (51) further comprises a horizontally arranged bottom plate (511), The bottom plate (511) is connected to the mounting plate (512), and the cavity (3) includes a cavity bottom plate (31), and the cavity bottom plate (31) is provided with a recessed portion (311) and a truncated cone (312), wherein the recessed portion (311) is annular and is located on the outer peripheral side of the truncated cone (312), and the bottom plate (511) is fixedly assembled to the recessed portion (311), and the truncated cone (312) is used to install the connector (4); both sides of the bottom plate (511) extend in a horizontal direction to form a first supporting portion (513) and a second supporting portion (514), respectively, for being fixedly assembled with the cavity bottom plate (31), and the first supporting portion (513) and the second supporting portion (514) are located on a side of the mounting plate (512) away from the bottom plate (511).

2. The microwave oven according to claim 1, wherein There are multiple roller assemblies (5) arranged at equal intervals along the outer periphery of the connector (4).

3. The microwave oven according to claim 1, wherein The roller assembly (5) further comprises a bolt (53) and a nut (54); the mounting plate (512) is provided with a through-hole (5121); the bolt (53) comprises a nut (531) and a screw rod (532) connected to each other; the screw rod (532) passes through the roller (52) and the through-hole (5121) in sequence and is then connected to the nut (54) through a thread.

4. The microwave oven according to claim 1, wherein The roller (52) comprises a roller inner ring (521) and a roller outer ring (522), wherein the roller inner ring (521) is used to support and shape the roller outer ring (522), and the roller outer ring (522) is sleeved on the outer side of the roller inner ring (521) for elastic wrapping, and the material hardness of the roller inner ring (521) is greater than the material hardness of the roller outer ring (522).

5. The microwave oven according to claim 4, wherein The roller inner ring (521) includes a first support shaft (5211) and a first limiting plate (5212), a first connecting hole (5213) is provided at a position of the first support shaft (5211) close to the central axis, and the first limiting plate (5212) is provided on the outside of the first support shaft (5211); the roller outer ring (522) includes a wrapping ring (5221), a first mounting hole (5222) is provided on the inner side of the wrapping ring (5221) close to the central axis, and the first support shaft (5211) is inserted into the first mounting hole (5222) and is limited by the first limiting plate (5212).

6. The microwave oven according to claim 5, wherein The roller inner ring (521) also includes a second limiting plate (5215), and the first limiting plate (5212) and the second limiting plate (5215) are respectively arranged at the opposite ends of the first support shaft (5211) along the central axis direction. A first limiting groove (5216) is formed on the outside of the first limiting plate (5212), the second limiting plate (5215) and the first support shaft (5211), and the first mounting hole (5222) of the roller outer ring (522) is sleeved on the first support shaft (5211).

7. The microwave oven according to claim 6, wherein A second limiting groove (5223) is provided at each of the two opposite ends of the wrapping ring (5221) perpendicular to the central axis, and the two second limiting grooves (5223) are used to accommodate the first limiting plate (5212) and the second limiting plate (5215).

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